72 dart fuel tank

I believe it should have about 5 volts. How are your other gauges working? 12 volts is stepped down to about 5 volts or so through the IVR and is used on your temp and oil pressure gauge as well as the fuel gauge. They can fail open or closed........Closed is bad news as it sends 12v through the gauges and burns them out.......That's all I got :)